Effector diversity seems to govern local adaptation of the rice blast fungus

(1)

HAL Id: hal-02739536

https://hal.inrae.fr/hal-02739536

Submitted on 2 Jun 2020

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Effector diversity seems to govern local adaptation of

the rice blast fungus

Jean-Benoit Morel

To cite this version:

Jean-Benoit Morel. Effector diversity seems to govern local adaptation of the rice blast fungus. 3. Annual Conference of the COST Action Sustain (FA1208), Feb 2016, Banyuls-sur-Mer, France. 97 p. �hal-02739536�

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Jean-Benoit MOREL

Effector diversity seems to govern local adaptation of the rice blast fungus

JingjingLiao1_{, Hichuan Huang}1_{, Isabelle Meusnier}2_{, Aurelie Ducasse}2_{, Francois Bonnot}3_{, Elisabeth}_Fournier2_{, Pierre Gladieux}2_, Didier Tharreau3, Thomas Kroj2, Jean-Benoit Morel2

1 College of Plant Protection, Yunnan Agricultural University, Kunming, China

2 INRA, Campus International de Baillarguet, UMR BGPI, INRA TA A-54/K, 34398 Montpellier France 3 CIRAD, Campus International de Baillarguet, UMR BGPI, INRA TA A-54/K, 34398 Montpellier France

Scarce cases of disease durable resistance have been documented in plant/pathogen systems. Their thorough analysis may help to understand how durable resistance emerges and is maintained and how it can be exploited in a sustainable manner. We analyzed the case of the durable resistance of glutinous rice to blast disease caused by the fungus Magnaporthe oryzae in the Yuanyang terraces (Yunnan, China). Multi-year sampling of fungal isolates on glutinous rice and non-glutinous rice indicated that two populations of the blast fungus co-exist and are only rarely exchanged between these two rice hosts. Evaluation of the number of avirulence (Avr) effectors in the two Magnaporthe oryzae sub-populations demonstrated that isolates from glutinous rice possess particularly high numbers of Avr effectors. Moreover, agressivity of these isolates on glutinous rice and non- glutinous rice varieties was correlated with the Avr effector content. Experiments with isogenic M. oryzae strains pinpoint one Avr effector that seem to play a key role in the local adaptation of the two blast sub-populations.

3rd_{Annual Conference of the SUSTAIN COST Action, Banyuls sur Mer, 17}th_{- 19th February 2016}